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Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b? will mark the

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25